To change/hide your IP address use any of the following:
- VPS
- Proxy
- Internet cafe
- Dongle
- VPN
Proxies are the easiest and cheapest way to hide/change your IP address. Make sure you buy dedicated proxies and not shared proxies, as there's a good chance that a shared proxy has already been blacklisted by eBay/PayPal.
As the above poster suggested, use a middleman service. Both sites the above poster suggested are no longer possible to use for this due to many people using those sort of sites for money laundering. If you think outside of the box, you can still find a couple of sites that will allow you to successfully transfer the money without leaving traces, I'm not going to mention these sites as they can be used for money laundering, which is illegal.