For sale or trade: 40 bucks, not including shipping
Poulan 2500
Good compression, needs a little tinkering to run. Needs a screw in the bootstrap by the A/V spring. Bar and chain can go with it. Your option. I'll take 5 or maybe 8 bucks off if you don't want the b/c.
Good candidate for a top end off of a 3100 or the like. IIRC, they do fit right onto these smaller models' crankcases. Wolf in sheep's clothes... good sleeper if you used the original 2.5 recoil cover.
Trades can be Mac saws other than Mini Macs, the Titan series, and the PM605/610/650 series saws. Or a Pioneer NU-17 or similar parts saw. Or throw something interesting at me.
If you want more pics of this saw, let me know.