I think any altcoin trading bot can do this job for you perfectly, you only need to set your target, check this bot https://bitcointalksearch.org/topic/gunbot-automatic-poloniex-profit-generator-1715214
Secondly, you might not need a bot for this type of trade, why dont you just set your buy order at your desired price on any trading exchange?
Topic: Does anyone know of a buying bot for accumulating? (Read 314 times)
A bot that buys a certain coin when it goes below a certain price, for polo, bittrex, cryptopia
I think you might want to avoid that or code it yourself so you know it is safe. accumulating is not that hard and some sites let you use hidden orders. 
A bot that buys a certain coin when it goes below a certain price, for polo, bittrex, cryptopia
but why do you need a bot for this??
you place an order with out expiration.. and if it will be hit, you are ok...
then, you can understand better which kind of order exist here:
http://www.investopedia.com/university/how-start-trading/how-start-trading-order-types.asp?ad=dirN&qo=investopediaSiteSearch&qsrc=0&o=40186
A bot that buys a certain coin when it goes below a certain price, for polo, bittrex, cryptopia
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