True...Spridget tops are cheap and easy to replace; you really should consider it one of those things you just change out every so often. Cost can vary greatly, from cheap vinyl to reeeally nice cloth. Treat your top nice and even a cheap one will last for many years. Cracked windows are nearly always an indication that it hasn't been folded properly.
Since you're a newbie at the ragtop game, and from your avatar I see you have an attached foldable 'hood,' (Britspeak for a convertible top,) you need to know that the Brit way to stow the thing is different from most other cars. It takes a little more time, but it results in a smaller folded package and keeps the hood safer. The "usual" way; (e.g., undo the latches from the driver's seat and just throw it over your shoulder,) will surely end in disaster. There's info online that'll show you just how to do it if you're not sure.
The short version: undo all the fasteners. Fold the top back part-way. Tuck the side windows under, pull the top off of the bows and drape it over the trunk while you fold the bows down the rest of the way. Make sure the bows aren't pinching the hood at any point. Make sure that where the side windows are tucked under, the crease is in the vinyl and not across the window! Then roll the hood forward and over the bows. Speed comes with practice.