Here are two offers from Jazz Casino & Sportsbook.
1) Deposit $500, receive a $500 bonus, playthrough $30,000 before
cashing out. Playing at 99.54%, you would expect to lose $138, but
with the $500 bonus, that's +$362 for you. Divide that by the
$30,000 to get a little over a 1.2% advantage.
2) Deposit whatever you want, choose the 1% cashback bonus option,
and play all you want at 100.54%. Just to compare the offers, with
$30,000 playthrough, you would expect to be up $162. One nice thing
about option 2 is being able to leave the game whenever you want.
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Both options are available in $1/$5/$10 levels and in single and
triple play, so you could play from $1 (short coin) to $150 per
hand. If you play single play, there is also a progressive to make
things a little juicier. There is also a free $25 chip with a $500
playthrough for new members. On the bad side, they charge $15 per
$2500 cashout via Neteller, so I guess that has to be considered
your tipping for the experience (this is unusual, but so is 1% CB).
Fairness (randomness) is always a concern, but I haven't found any
difference at online casinos vs. land-based casinos. The first time
I ever played blackjack on the Strip for $50/hand, I won 1, pushed
2, and lost 21 out of 24 hands for a nice $1000 loss in no time at
all [and yes, Victoria, I played perfect basic strategy---my
strategy card was right in front of me 
]. 'Splain that, Lucy!
I just thought someone might be interested in an offer like this, so
if you have any questions, send me an email.
Jeff