First, everyone needs to be aware that HS sports in Canada are nothing like HS sports in the US. A HS ski team here usually means a a teacher who skis, maybe raced, takes a bunch of keen kids from the ski club, "trains" a few evenings then there is a local race. The talent will be wildly varied, and it is about having fun in a competitive activity, on relatively easy courses.
Kate - as JPL pointed out, you probably want to look a "recreational slalom" ski. Almost all the manufacturers make a ski that looks like their top level race ski (which usually have FIS, WC or Worldcup as part of their name). Atomic Redster, Rossignol Hero Elite, etc . You want to look for a 155cm or 158cm ski with a 12-13m turn radius, which will be good for slalom races, and will be OK for your GS races too.
Try looking around on asogear - they are the web store for Corbett's in Mississauga ON and they often have off-year race stuff for good prices and offer free shipping.They are also pretty good if you call them up and explain what you are looking for. If you are doing more slalom than GS, you could probably do OK on these Dynastars and they fit the budget
Other alternatives for off-year equipment are raceskis.com and Al's Ski Barn, but then you have to deal with US exchange and shipping. You might also want to try the Facebook group - Ski Racing Buy and Sell Canada.