New stocks can be orders direct from H&R(see the Retail Parts page in FAQs) and Brownell's, used stocks can be bought in the H&R Classifieds here at GBO. Boyd's sells the lam t-holes in their discontinued and seconds. Choate makes the synthetic stock and can be ordered from them and other online retailers. GBO sponsor Gunstocks Inc sells aftermarket unfinished stocks, sponsors can be found at the top of the Links list.
I've bought a lot of my H&Rs used in parts and put them together myself(see barrel fitting in the FAQs), but have bought several used rifles in the H&R Classifieds, have ordered a few from local dealers and others from 3 different online dealers, RR, TGS and Bud's.
Tim