I've got a Walther CP99 Pellet gun. It's the one that you load a round magazine into the center of the slide.
On one hand, the trigger is a pain, doesn't matter if you shoot single OR double action, it's a high pound trigger. On the other hand, cocking the gun by pulling the slide back, and shooting that way takes about half the load down, but...it's still a hard pull (smooth, but hard). All this sounds terrible, but it's actually a fun, fairly accurate gun to shoot. Short barrel, looks accurate to its center fire version. I have a Vortex red dot sight on it, my indoor, "range" is about 18 yards, but shoot this at about 20+ feet.. I can put the (8) rounds into just under a 1" circle, minus normally one flier. Not bad for a short barreled, CO2 gun from what I've seen others do on YouTube. The magazine seems best to shoot wadcutter/flat nose pellets.
It is a little over your price, but I think it's worth it. It's $180. Comes in a nice plastic box, two round magazines, a second butt plate for the grip to make it comfortable for different sized hands. The CO2 cartridge is loaded into the grip magazine. It holds pressure well if you don't want to empty the whole thing.
Mike
P.s. - It could actually be used as a "trainer" of sorts. The trigger pull is so hard, that it makes most other guns trigger pulls seem like oz. pulls. But like I say, still accurate and fun to shoot.