I did find a couple of sources with good ratings offering red yucca, Sooner Plant farm and Forest farm. Sooner offers gallon sized plants, which is a bit larger than I'd like to pay shipping for, and FF is kinda pricey on shipping if you're only ordering single or few plants (although they are packaged beautifully- the extra attention they give ensures receiving quality product). As spring draws near, I'll keep my eye out for other companies that may offer them as well.
