Unless you are just wanting a glass greenhouse you can get a Harbor Freight of the same size for $329.00 and use the rest of the money to furnish and set it up.

Here is a link that might be useful: Harbor Freight Greenhouse

I had questions about this particular greenhouse and emailed some questions to them on Monday. Haven't heard back from them yet. There are no phone numbers on their web site to call, which kind of worried me in case I need to actually talk to someone when putting it together. I was going to get this greenhouse plus an extension kit. Can't find a price on the extension kit though. I like it because it's still a reasonable cost ($450 at Costco email site) but has the type of glazing you can see through.

Lots of people seem to like the Harbor Freigh greenhouse though.

Is this number just an answering machine?
Toll Free 24 Hour Order Line 1-877-718-2865
Click on models and prices and you'll find the extension

Here is a link that might be useful: Extension 399.00

so I guess the deal is you pay $450 for the customer support. I was looking at the manufacturer's web page perhaps. But this has the extension information, thanks!

The best deal I found was at the link below. The greenhouse price includes shipping, a base, shade cover, and a book on greenhouse gardening. I have not bought one of those greenhouses, but I get supplies from them and am happy with their service.

Here is a link that might be useful: Enthusiast Greenhouse

Here's my Juliana 8.3 HGH.

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I've been seriously looking at the Julianas, how long did it take for yours to arrive after purchase? Any particular problems in set up? I've read that the Juliana instructions are poor, but then it seems like people complain about other manufacturers as well!

Approx. two weeks from order to delivery. But then again I bought mine in Sept. which I'm sure isn't the peak season.

The instructions were in French but it was a cinch to put together (4-5 hrs.) by myself using the illustrations.

No problems or setbacks in setup. All the holes remarkably matched up. The materials consist of of aluminum and polycarbonate, no steel to rust. Even the nuts and bolts are aluminum.
I've had it for several years and don't ever regret purchasing it. They have the best warranty that I have found (12 years).

The Enthusiast greenhouse is made in Israel. The site listed is not a manufacturer, they resell many greenhouses. This unit is a nice starter greenhouse if you plan to use it a few weeks into the fall and start a few weeks early in the spring. It is single walled and the manufacturer does not recommend heating. Overheating is also a consideration. There are quite a few places on the internet selling this greenhouse. I would recommend purchasing from a company that will take your calls and answer your questions.

is the harbor freight greenhouse the same setup - just for fall and early spring? I need one for also holding over tender plants during the winter. I'm trying to understand how this one would not be good for heating but the harbor freight would. So much stuff to learn!

The HF greenhouse is a twin wall polycarbonate. The heat loss value is .70.
The Enthusiast is single wall polycarbonate. The heat loss value is .120.
This means the HF will use only 'about half' as much heat.
There is a chart 1/2 way down the page in the link that explains R-value.
Also the single wall polycarbonate may be subject to warpping or melting if the heater is too close.
Have you ever seen a vinyl siding house where someone had the BBQ grill too close. It melts.

Here is a link that might be useful: Heat loss values

gardenallyearlong: You said "This unit is a nice starter greenhouse if you plan to use it a few weeks into the fall and start a few weeks early in the spring. It is single walled and the manufacturer does not recommend heating" which makes me almost regret ordering mine. Just arrived yesterday and never saw any manufacturer's warnings. May I ask where you read the pros and cons? Thanks.

We sell these at our company Poly-tex.com

call us or check us out online!

800.852.3443
www.poly-tex.com

i also forgot to mention we have a closeout sale on extension kits for Enthusiasts. Check them out. They are half off!

Here is a link that might be useful: poly-tex.com