I assume the Whitehorse you refer to is in YT? If so, I guess that rules out craigslist (where I get most of my gear, cuz I'm cheap).
You've already got what I consider to be the absolute must -- a decent helmet. Next on the list for me would be the jacket. If you can wait out the shipping, most of us are big fans of
www.motorcyclegear.com (formerly newenough.com). First place to check is their Closeouts and Last Chance areas. But even their regular pricing is good, and I've seen no complaints about the quality of their merchandise.
Then I'd focus on the riding pants. Again MG.com is a great start.
The rest I'd just be checking ebay and other sources, keeping an eye open for deals. What you have now will suffice until you can upgrade.