Mark Wahlberg 's got a new neighbor down in his exclusive enclave in South Florida, and the guy's got some pretty deep pockets ... because billionaire Russell Weiner just dropped $19 million for an estate around the corner from Marky Mark ... and we've got a look inside. Real estate sources tell TMZ … Russell, the billionaire behind Rockstar Energy drinks, bought a home near Mark in Delray Beach's Stone Creek Ranch for $18,005,000. Here's what $19 million, give or take, gets you in a small