If you're tight like me then try the scrap yard, leading edges on digger buckets, digger buckets etc, there are lots of things down there that're HT steel and only cost 60-90c per kilo, flick them a box of beers and they might gas them to shape and gas a couple of holes in them for you.
Just pulled out the price we paid for AR500. A piece 300x300x10mm was $41 each +gst.
Interestingly, we were originally quoted AR400 which was only $1.21 cheaper per piece.
This is very competitive pricing and they dropped their margin to low single digit so you would struggle to match this but, in the bigger scheme of things, plates aren't expensive.
Projectile velocity is the killer of steel plates, more so than bullet weight. Have a look at https://youtu.be/AX4AqkqQJg8
Ar500 is the business, punched loads of holes through 16mm stainless at 320m, only a very shallow dimple with the ar500. And it rings rather than makes a 'whack' sound so far easier to hear a hit at longer ranges
I just got an IPSC made up from Hardox 450 15mm thick.
What will this be able to stand up to?
I had the local engineer here chop up an old digger bucket, not sure what steel it is but he said it was a bastard to cut, its about 14mm thick and takes a pretty good thrashing hasnt really had any big cannons on it yet (270wsm and 300saum are biggest so far) but its soaked up hundreds of rounds from 270, 30-06, 223, 260, 308 etc, only cratering it has was from me "experimenting" what would happen shooting it at 100 with 270 and it put some pretty good craters in it.
Sure its not plastic? 270 denting steel....you're having a go
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