Heres 2 free Bots
I dont know if price comparing can be done with these 2 Bots.

BetSoftPro

JetBet


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Some very easy to use BOTS that can separate price differences.

The Bet Engine
Very good , it can do a wide range of things & is easy to use.
2 or more systems can be run live with this.
Has very handy Sim mode for testing systems using pretend money.


BetFair Manager
Min bet is $5.00 with this.
Its very good, it will even monitor your horses price & only bet or lay it if the price changes by a certain percentage in or out.
They have a number of staking plan that are very good.
Has Sim mode

BetBotPro
This is the one I personally use.
This allows one to bet under the 5.00 BF limit. But try not to make a habit of it.
It also has a very handy Simulation mode along with simulated bank .
It has a very easy to use facility for storing your various strategies.
Has a number of staking plans.
One can run 2 Bots live with this ,say win & place betting.
Has its own virtual bank for each system stored.
It can store over a hundred systems with ease.


They all have free days trial usage.
They are all very user friendly.
They all have their own Forums.
They can all run approx 3+ systems at once in Sim mode for system testing without having to use real money.
It uses a virtual bank so you know where you are at with each individual system.

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Cheers.