I have an existing electrum wallet.

I would like to pre-generate a lot of BTC addresses for an online store. How can I do this without running bitcoind, which takes up a lot of CPU resources? I don't want to use a tool like PyWallet or "Bitcoin Address Helper" (or whatever it's called). I want to do this programatically so that I can eventually automate it.

(E.g. there will be an existing queue of, say 500 BTC receive addresses, and when it gets down to 100, my system will auto-generate the needed 400 in order to get the queue back up to 500 addresses again).

Is this possible without running my own instance of bitcoind?