Look for these fall fruits and vegetables at farmers markets and in produce departments for the best flavor (and greatest value) in season. Specific crops and harvest dates of fall produce will depend, of course, on your region's climate. See these state-specific seasonality guides for more details.
If I remember right Walmart has a 30 day return policy with a receipt. Without a receipt the only thing they will do is exchange it for the exact same thing. If you have the receipt you should be able to get if fixed by the manufacturer, but sometimes they only have a 90 day warranty.
Insulin syringes can be bought easily enough without a prescription. Just go to any Walmart pharmacy counter and get a box of 100. They are kept behind the counter and you have to ask for them. They come in different sizes and needle gauges/lengths.