these days you can easily obfuscate your coins yourself
(trezor makes this a very simple task)
there is no real need to mix/tumble coins anymore
and when mixing, all you are doing is mixing dirty for dirty so a bit pointless

there are also numerous ways to exchange coins
like trading for altcoins and back
play poker against yourself etc.
but these will cost a bit to do

other than that you have Helix (2.5%)
that will give you new unsed coins

one other thing to note, is where you spend coins
and why you need them mixed
ignore the paranoid info you can read everywhere,
posted by mixers that want your 3% commision
unless you plan to hold the btc for a long time
or you plan to use an exchange like coinbase to cash out
there is no real need to mix