First, flats are random events. They have little or nothing to do with the tube or the tire. They just happen. I've had more flats than I can count on new tires, old tires, mountain bike tires, road bike tires, tire liners, kevlar belts, etc. I've had flats caused by goatheads (look it up), wires from tires, tacks, 16 penny nails (at the bottom of a 25mph + mountain bike hill just before an uphill), screws, tree thorns, glass, and under inflation. With the exception of the under inflation (it's a mountain bike thing), none of those was the result of something I did. Learn to fix the flat and move along.

Second, flats that result from the bike standing unused for a few days to a few weeks aren't random events. That's just physics. The tube is mostly impermeable to air but not completely air tight. Air leaks out over time. The higher the pressure the faster the leakage...generally. Check your tire pressure before every ride, especially if you haven't ridden the bike in a while.

Finally, a patch costs less than a tube. Learn how to patch tubes. You don't have to stop patching at 1 or 2 or 10 or even 20 patches. The most I've ever had is 25 and the only reason I quit was because the stem pulled out. That, and a blowout, are about the only reason a tube is unusable.