BBTS would be too expensive... get it from Chimungmung, they've got their 3P items in a per company itemization. as everyone has said the tfw 3P thread is where you can get product descriptions , company reviews and other statistics , then when you've decided which ones to get, definitely from Chimungmung.
Of course a lot of these are quite pricy nowadays especially the older ones. The thing is, 3P are always going to be pricy even on first release. So, best to scan thru the latest ones, and pick out which you want and buy them while their available. Coz, when these ran out, usually the second runs are more expensive...
Some recommended figures - all of which are available at Chimungmung.
1. Maketoys Giant ( not devastator)
2. Fans Project (FP) Causality not stunticons
3. Fanstoys QuakeWave - not shockwave
4. Fansproject Function X1 - not Chromedome
5. MMC Hexatron - not Sixshot
6. Mech Ideas - Apex and Gemini - not Twintwist, Topspin
7. Igear for minibots and Generations Kup alternate head
8. Maketoys Battle tanker add on,
9. Dr Wu for accessory weapons
Wanted AM partner Vanguard, Myclones Dirge, G1 Victory Leo, e-hobby Dark scream ( the black version), e-hobby Magnificus
Parts- AM partner Basher-side guns, G1 Actionmaster Elite Windmill's blades[I][B]