Cappy:
For your $100 budget, you're not going to see a heck of a lot,

but try these as options...
1. Lake City Inn as per Polska - at least it has a pool. North side of Lougheed across from the bowling alley (Revs aka Brentwood Lanes). Closest to the fields.
2. Executive Inn on Lougheed (behind Tim Horton's, west of Brentwood) fulfills the shopping request, and is close to the Shark Club (this is the one that people get shot at).
3. A splurge: the Hilton at Metrotown. Shopping heaven for the girls.
4. Failing that, Daemonspawn #1 has offered up his room to share with the girls (what can I say - the boy's ambitious). He says to tell them that "he plays soccer too..."
Trece (another former Burnaby kid)