There are plenty of parking structures and lots within a few blocks walking distance. Those lots and ramps will run you between $15 and $30. If you’re willing to walk 5-7 blocks, you can pay as little as $5 for a ramp or lot.
There is plenty of parking around the arena, although it can be a bit on the pricey side, usually between $15 and $30. You may want to try to find some street parking or a garage farther away for around $5.