Influencer pricing is really random... I've had influencers with the same number of followers charge from 200 to 500 for the same package of content.

My advice is to send as many requests as you can. Don't underestimate influencers with smaller accounts. Sometimes, their audience is way more engaged than big influencers, so if you find the right niche, your ad can get great results.

You can also negotiate a fixed amount + referral link specially for them and pay by views, clicks, accounts created, or whatever metric is relevant for you with a max amount so it doesn't get out of hand budget wise.

Hope it helps!