You can get a new laser assembly from the auction site and change it yourself. Do a search for HD DVD laser lens. They are listed for XBox but people have installed them in Tosh players with no problems. They go for $7. If you don't want to go that route, it would probably be cheaper just to get another player.
You cannot swap drives on the XA1. The main board & drive are married together on the Gen 1 players, and must be replaced as a set. If the drive alone is swapped out, the unit will not boot. Also, the Xbox lasers are Gen 2 type, and are not compatible with Gen 1 or 3 players.