Recently I have not been doing that much tumbling. It does not really seem worth it if you are buying your coins in a way where you do not need to provide a shred of personal info. (You should never buy coins if you are required to link a personal bank account unless there is absolutely no other way.) And if it's just $100-200 you are going to be moving over to the markets, it just does not seem worth it, as the fees for tumbling sites, like Helix, are rather steep. Although, the added level of security tumbling gives you is very good, especially now with the news that bitcoin transactions are very heavily monitored by the US government. (If you want more info on this, google US bank secrecy act, and the US department of treasury. CoinBase, Circle, etc., basically any site that requires you to link all your personal info complies with this rule.)
I've been hearing a lot of buzz recently about a few easy and quick free tumbling methods, through exchanges and such that do not require any personal info and can all be accessed via Tor. (I would like to avoid listing gambling sites, as it's been recently reported that they are no longer a good option of erasing taint.) If this is the case, there is no reason I can think of as to why we should not be tumbling. Especially as this greatly reduces or eliminates the chances for any honeypot schemes, if a site like Helix or BitBlender where to every be compromised. (I do not count Bitcoin Fog as a legit method for obvious reasons.)
So if you know any quick and simple free tumbling methods, and would care to enlighten the community as to how you do it, I think it would be really cool and benefit us all if you would take a minute to list them, and perhaps briefly discuss the process so that novices can understand.
Thanks.
Open a new empty LocalBitcoins account. Use Tor if supremely worried.
Deposit coins in there. Wait a few hours. Withdraw them. They will come from totally different wallets. Test it with random coins to see for yourself. You may not even need the wait.
I re-iterate for the umpteenth time, though, that tumbling coins is a waste of time and money for random buyers. People are applying "vendor-level" paranoia to buying activity, which is silly. No one is even tumbling to escape the wrath of LE, which simply doesn't care about buyers; they're tumbling to escape the wrath of Coinbase and similar exchanges which frown upon using their customers using DNMs.