Indoor surfers have ridden the last wave at Adrenalina, an experimental surf and extreme sports apparel shop that is closing this week after a two-year run at International Plaza in Tampa. Controlled by Broward County entrepreneur Ilia Lekach, a veteran cosmetics retailer, Adrenalina attempted to attract surfing enthusiasts to buy apparel at a store using a glassed-in FlowRider artificial wave maker as a drawing card. About 15 percent of the business was supposed to come from boarders paying $20 a half-hour to surf the FlowRider, but clothing sales failed to hold up their end of the formula. The chain is now down to its last two stores and the once huge apparel selection at IP months ago was dramatically reduced to a few aisles. On Wednesday, the sparse remains were offered at closeout for $1 apiece. The 35,000-gallon surf machine, which spits out a 4-inch sheet of water suitable for wakeboarding, may be sold to another surf shop chain.