That sure is high $$. I've not seen your model, but my one sided 12 inch Trademaster was only $450 brand new. Be better off buying a new one if I had to pay that for replacement rollers.
Do a search on the web at Nextag.com or similar discount listings.
I did do a search on ebay and they have some planer blades for your model, but didn't see no rollers.
Ebay Items - planer blades .....if your interested. I don't know anything about them or the seller. Just passing info along I found.