-109 for -1 RL.
I split my bet between the ML and -1.5 RL at whatever books offer the best prices for each. That'll get you to basically a -1 RL bet. You'll get better odds that way than just using a single books Alt RLs that are offered at -1.
If you don't want to have to cypher through the numbers to get what the odds would be on -1 RL splitting between ML and -1.5 RL, use this online calculator.