I use pyramyd but also wherever has the deal and is in stock. Got a few things locally at big 5, got my real guns (marauder and wingshot) from pyramyd, ammo and some gamo plinkers from amazon. Lots of variety. Fwiw amazon is just a collection of sellers. Good chance one has what you want but you gotta look hard. They stock the most common, fast selling stuff so gamo and hatsan being avail there makes sense.

Edit: this is the best I’ve seen in my five minute search: https://www.amazon.com/dp/B08RB9KT5Z/ref=cm_sw_r_cp_awdb_imm_K7ZVDGG6RAY8E9M48E3W