I don¡¯t often suggest AliExpress, but you can get cheap ones from about $50 that will do the job you need one for. Some of those will directly connect to your phone (most are for android but some have iPhone options) although most are standalone units. All of the ones that I looked at are able to take screenshots that can be transferred to a pc very easily as well.
If you do go the AliExpress route, I would recommend getting one from what they call ¡°choice¡± section. That way you don¡¯t pay postage and if it turns out to not be junk, then the return is free. It just gives you that extra protection.
