"After a year of heavy use"...A YEAR!!! I play three to 5 times a week for 8 months and about once a week in winter, and I go through 3 pairs a year.
Don't cheap out when it comes to your feet, ankles, knees, hips....the surface is bad enough as it is. By the time you see physical wear, like your "sole almost gone" you are easily a month or 2 beyond when these shoes ceased to give you any support. This will bite you in the arse in the long run (assuming you play at least 4.0 level, and you aren't under 140lbs.), and orthopedic surgery and physical therapy are much more expensive.
Now...that being said, you don't need expensive shoes...look for closeouts, and when you find a deal buy 3-4 pairs at a time, that'll hold you over for 18-24 months. Hoop shoes are fine, and probably in abundance on the cheap, they simple wear out quicker because the sole implies you are playing on hardwood, not asphalt. If you are on a tight budget then don't buy new racquets, that's the biggest scam, buy perfectly good used sticks off the "Bay" and use your saved pennies to PROTECT YOUR JOINTS!