Bestbuy will carry them in the Monster variety (not that I reccomend either the brand or the vendor for buying cables) and Radioshack will have their own brand in normal and gold levels. Sorry, don't know of any cable places online, what do you mean by high quality? $20? $2000?
For a short Y adapter, anything that does good contact and is not broken will do just fine. You don't need to spend a lot of $$ to buy something that achieves this, I guess many inexpensive adapters will be fine.
Edit: I'd wouln't connect the Y part just at the Revo connector. It can stress too much the connector due to its weight.
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