Budget Golf offers the adidas Golf Men's ClimaLite 3-Stripes Half-Zip Pullover in seven colors (Mid Grey pictured) for $19.96 plus $7.99 for shipping. That's $7 under our mention from last October and the lowest total price we've seen. (Except for the mention below, it's also the best deal now by $2.) It comes in sizes S to 3XL, although not in all size/color combinations.
A close price: BudgetGolfer via eBay has it in power red for $26.95 with free shipping in size 3XL only.