Huh??? What do you mean hard to find in large sizes? There are literally thousands upon thousands of listing for ddr2 ram on Ebay, Amazon, Newegg, TigerDirect... I mean, the filters on the left of Ebay let you choose from which continent to order so you don't have to deal with the "order-from-China-and-wait-6-weeks" thing, & still have a very reasonable purchase price. How many Gigs/stick are you looking for? How many gigs total? It's all there on Ebay, bro. You can choose Gigs per stick, total gigs, ram speed, price, purchase method(s) (buy it now vs. auction)...everything. If you wanna post the specs of that which you want, I can look it up for you. Here's the listings for Buy it now, North Armerica, ddr2, 2GB/stick, 4 sticks, 8GB total.
Here's a reputable dealer with over 72,000 sales & a 99.6% customer rating. It's for brand new, unused ram. $25 for 8 gigs all day long. You can sort the filters for total gigs, gigs/stick/ speed, to your own liking.
https://www.ebay.com/itm/8GB-4x-2GB-DDR2-PC6400-LOW-DENSITY-PC2-6400-800-Mhz-DESKTOP-MEMORY-RAM-INTEL-AMD/331649720364?hash=item4d37dd202c:g:u2EAAMXQPatTHVwR:rk:10:pf:0&LH_BIN=1
and this guy...
https://www.ebay.com/itm/2GB-New-For-Samsung-DDR2-800MHz-PC2-6400U-DIMM-Desktop-RAM-memory-intel-CPU-US/332698371737?hash=item4d765e4699:m:m1PgFl8ARjsrp7N6IrQXyww:rk:1:pf:0&LH_BIN=1