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I do that on the fly or update ever $x hours with xml, json
It's done with a server cron job every $x hours
$xml = simplexml_load_file('marketplace_feed_v2.xml');
so after an hour of errors I check if I installed the PHP xml module --It was not a core module PHP=Windows DUMB

Anyway --the right way would be to update the prices and quantities in 'real time' on demand on your website --that data 'should be available' ...