I enjoyed this place a lot:
It's 2.2 miles from the stadium, but you can catch the 99 bus and be there in half an hour. Lots of great waterfront dining nearby, especially Anthony's Pier 66 and The Crab Pot.
The Beatles stayed there during their last American tour, and Led Zep got kicked out.
Good post Eddie, but booking less than 10 days ahead, right around July 4th, I'm skeptical of one's ability to secure anything quality much under $200. Could happen though, doesn't hurt to look.
There are some DT hotels under $150, but the consumer reviews tend to be poor.
And, everyone's "walking distance" is different. If your willing to be 2 or more miles away one way, you'll be able to cut down the rate while maintaining the quality. Heck, if you willing to be 7-10 miles away, you can go under $100 I'm sure.
Actually the Alexis is a decent walk to the ballpark and close to Pike's Market etc. At this time of year they will be around $250-$275 and they include a $20 voucher against eats at their own restaurant.
"Boutique" style but always had good experiences there.
The Edgewater appears to be booked up on that date. Here's a list of hotels with their distances from Safeco Field: