Hi, the advice to go to Harry Rosen Oakridge was very good. The Oakridge location does seem to have a larger selection of smaller sizes. I was there today and saw a Copley suit 34s. They also had a 35s. I beleive they were either charcoal or navy pinstripe. Harry's has a sale upcoming (I beleive it's starting next week). It's a safe bet that these suits will be at a small discount. I think they were about $1100.
Sounds expensive, but if you can save a little more they might be a good option.
You other option is to go MTM (which will cost you more), or go bespoke at a tailor. YOu can probably findn someone who could do a suit for 700-800 bucks (the fabric will be nothing impressive though).
Honestly, the difference is worth it. For $500 bucks you aren't going to get a great suit. For the extra 500-600 bucks you are going to feel alot more confident about yourself. If you're using the suit for an interview, all the more reason to spend that extra amount (think of it as an investment). Obviously I don't know your financial situation, but if you can save the extra money by not going out to restaurants/bars for a month or two, I'd highly reccomend it. If you're a single father raising kids and it's a choice between feeding said kids, or buying a nicer suit, I guess the choice is obvious.