My suggestion is to buy them used. So far I've purchased ~4 Apple devices for family members on Swappa, each time I got a pretty good discount over the new device. So while an SE is $429 new, you can find one in mint condition on Swappa with 95% battery health (the most important detail when buying a used iOS device IMO) for $220, and if you're tight on cash and want to really go cheap, buy one that's been scuffed up for around $130.