I do not see the actual compression tool listed on the Jim's website. Do you happen to have a part number? Anyone else know of a compression tool out there??
I ordered one from Tejas Thump Cycles (806) 539-0187 for $79.00 bucks (part# 20722) Valve Spring Compressor- EVO. Big Jim has one but wants $159.00 for it. Unless you own shop and do not have much use for one, I would go with the cheapy.
You can also Try NELSON at WBCycles (sales@wbcycles.com) I know he can get one for you.