I would say it is a good price. The closest model to that capacity is the SM066. The electronics have a tighter temp swing but on an empty 3 hour test the averages between the two are real close. Here is some information on that unit.
$300 is a fair but not great price. $200 would be a great price. Check the grates. If they need to be replaced, that would lower the value. FYI, I don't see replacement grates on the parts pages, maybe the SM066 would fit.
If it is in good shape and still avialble, take it. I have purchased about 10 used smaller CS ovens. (008/009/025s) Also have an 160 - this equipment behaves so consistently I can't suggest any moderately priced used item is going to disappoint you.
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