There is also lowendspirit, but in both cases you have to be very careful what you buy - not everything that is advertised there will work as advertised or will work long-term

where they will double your monthly data limit for free when you comment your order number.

where they use you to spam the forum thread (for giving away something rarely anyone has any use for)

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Pretty much anything that’s only available via an app store. The difference with web apps is that I can also use them on a laptop/PC and I have a bit more control about tracking (by using ad/tracking blockers).

not being forced to have an Android or Apple smartphone, so more open standards and just Web apps instead of proprietary apps