adidas via eBay offers the adidas Men's Speed Trainer 3 Shoes in White/Metallic for $38. In-cart, the price falls to $30.40. With free shipping, that's $2 under our mention from three weeks ago and the lowest price we could find by $20. They're available in select sizes 4.5 to 11.
Frugal isn't smart if you put off replacing these things. Waiting too long can cost money or even endanger your health.