Depends how much $ per install. For now planing around 1k-10k installs. It's about one app for now, if everything turns out well further cooperations could be done.may i know about how often,how many apps and which apps do you need?
Take care, quality might be low if too cheap so that it affects your app's ranking negatively instead of positive.Searching for a very cheap way to get some installs on my android app, no matter where they are from.
Anyone can recommend a website?