If you use the word 'liners' in your search, you should get quite a few hits to sort through. try the search words berberis helmond pillar liners When you call to ask, don't forget to ask the grower who might have them if you strike out. Al Here is a link that might be useful: Here's one

being conifers.. you might want to check in at the conifer forum.. the peeps who graft .. have all kinds of sources for understock ... which is basically what you are asking for ... but for the fact that i dont think yew is grafted... lol ... ken

strobus pendula grows 12 to 16 inches per year .... you can mail order one for $25 ... and stake it to 8 feet in less than 4 years or so ... i dont know why you would consider paying a lot of money for a big one .... its NOT prime conifer shipping time in the heat of summer.. but visit the link to see whats available ... there are many other GOOD mail order places .... another CO'er this spring ordered a bunch from forest farm and raved .... late sept/oct is time to plant.. you have plenty of time to plan ... no long term memory here.. lol .. must have been some other recent post about shade .... oh i recall that pungens post with the yellow new buds ... whatever ... most conifers prefer dry feet... if you are watering that compressa so often.. as i thought.. you have a soil problem ... it shouldnt be draining that fast ... and the conifer probably would NOT care all that much after 3 years.. you have a greater chance of killing it.. after 3 years.. with too much water.. rather than not enough .. be careful ... or go in there with a hand trowel.. and see whats going on under there .... it is NOT the plant sucking the soil dry .... anyway .... think smaller plants.. and mail order.. to get really exclusive unique stuff .... ken Here is a link that might be useful: links

Be aware that directgardening.com has a 78% negative rating on gardenwatchdog.com. But maybe it will help you find a name for a red cultivar that you can use to search on. I just wouldn't buy it from them.