Hi @socalrs247,
If you've already signed up for Square and received one free magstripe reader, additional magstripe readers do cost $10. You could always try contacting support directly and asking super nicely, doesn't hurt to ask.
Another oddball option, which might work (I have not tried this). The iPhones used to come with an Apple Lightning to headphone adapter. If you have one of those laying around, you may be able to use the old reader with that, although the reader will no longer be flush with your device. 😉
