Joss Thor Hammer is underrated, budget friendly and breaks lights-out. I have an extra weight bolt for it too. There are a few small nicks in the shaft but otherwise it's in good shape. The Jacoby Jumper works great, but I generally kick, so its seen very little use. If you are local to Milwaukee area, you can have both for $300.
Have a Billiards Warehouse jump break with 2 shafts itbcostv$275.00 I’ll sell for $125.00 + shipping Verybclean & straight m very solid cue , PM ME IF InTERRSTED
I can sell you a brand new, never chalked, all Carbon Sniper 3 Jump/Break for very close to your budget. I use one of these personally and sold my nearly brand new Predator BK in preference to the Sniper. It hits like a freight train. If you are interested, PM me and I'll send you some pictures.
Predator BK4, sport wrap, tiger icebreaker tip, excellent condition, one small chip in clear by butt cap, $375 shipped. I also have a BK Rush break shaft for sale, it was used with this butt.