Gabriel, I have the BUS AR 1X 4MOA AIMPOINT and it works well : budsgunshop.com/product_info.php/products_id/712016200/bus+ar+1x+4moa+aimpoint+base+red+dot ------------- I also have two Firefield FF26028 Impulse Compact that are also very good and affordable : budsgunshop.com/product_info.php/products_id/101542/firefield+ff26028+impulse+compact+red+dot+sight+1x+22mm+obj+illuminated+circle+dot+red%2fgreen+black+matte+cr2032+%281%29

Not sure what your definition of affordable is, but $100 or under the TruGlo and Sightmark sights are quite good, they hold zero well under recoil. For a bit more, a Vortex Spitfire, Holosun are all good. I like Vortex simply for their warranty.

Affordable means different things to different people there ate some sitemark and other options that are in the $50 dollar or less category, but id say If this is going to be used for home deffense you can hopefully go into the $100-$200 range and I. That price range you are going to get proven performance and reliability.
The sig Romeo5, sig MSR are both great options for $100-$160ish
Romeo5
Here
https://gun.deals/search/apachesolr_search/sor50000
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Msr here
https://battlehawkarmory.com/product/sig-sauer-electro-optics-romeo-msr-1x-20mm-2-moa-red-dot-black
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Vortex crossfire is a good option too, Vortex has the best waranty in the game at any price point they really stand behind their products
primaryarms.com/vortex-optics-crossfire-2-red-dot-sight-2-moa
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Vortex spare
primaryarms.com/vortex-optics-spar-ar-ii-micro-red-dot-sight-2-moa
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If its just a range toy and not for home deffense the leapers utg or the NC star will work just fine
primaryarms.com/1+Red-Dot-Sights/MCategories+Optics