It's very time consuming, inaccurate, and unethical to try and get a quote for a bunch of games over the phone. Usually the employees are busy helping people and wouldn't be able to process your request if you aren't there in person. Best course of action is to take your games up there, that way they can properly assess the value of your lot and give you an offer. As for your question about checking their page for prices, that option is not possible, not to mention prices fluctuate quite frequently.
You would need to just bring the games in and ask them. If you're not happy with the price you can always decline their offer.
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