"...it costs me a bit much..." You reloading? Doesn't help much cost wise, but it's less expensive than factory. Plan 'B' would be another of the same rifle with the same sights, but chambered in a less expensive cartridge. A .223 or other varmint calibre will do nicely. not exactly the least expensive way to go though.
"...150+ meters..." Too far for most .22's. Any wind will blow those little bullets all over creation. However, sight picture, trigger control and breathing is the same no matter what the calibre.
"...buying the more pricey stuff like eley or lapua..." Gives you no gurarantee that whatever .22 you have will shoot it well. Trying as many brands of ammo as possible is essential with a .22 though. The price of said ammo doesn't matter.