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Another option is to check your local metal supplier/fab shop, they can usually cut anything up that you need. Just got a couple 1/2” AR500 plates cut to my size specs plus mounting holes for a reasonable price.
Colton at Prairie Precision Steel is the only guy in Canada i'd recommend. He's a huge supporter of the sport, sponsoring matches continuously, and his customer service is top notch.
Just be prepared for what might be a surprise. I asked the local fab shop (last year granted) and due to the fluctuating costs at the time, they told me they could get me a price for a plate (before cutting) but I would have to pay for it within 36 hours or the quote would no longer be valid. I asked if they could just ballpark it and I was told not without something close to a commitment. Now, this could also be because this shop it consistently busy as hell serving the local mining operations, so it probably isn't worth their time for a one-off walk in customer