The Houston Astros have a stacked farm system.  All of those years finishing in last place with 100+ losses are starting to pay dividends.  The following 3 players have a lot of upside potential, reasonable card prices and a path to the major leagues(one of them was recently promoted).

1. Alex Bregman is Houston’s 1st round pick from the 2015 draft.  This year at age 22, he’s more than held his own in AA with a .975 OPS.  His non-graded base auto found in the 2016 Bowman Chrome set have been selling in the $100-$120 area with BGS 9.5 versions selling in the $200 area.  Here is a recent list of what his cards have sold for on eBay.
2. A.J. Reed is Houston’s 2nd round pick from the 2014 draft.  Last year, as a 22 year old, he dominated high A and AA with a combined 1.044 OPS. This year in 59 games at AAA, Reed posted a .854 OPS and was recently promoted to the major league club.  His 2014 Bowman Chrome non-graded base auto can be found for as low as $40 with BGS 9.5 versions going for about $100.  Here is a recent list of what his cards have sold for on eBay
3. Derek Fisher is Houston’s supplemental 1st round pick in the 2014 draft.  This year as a 22 year old in AA Corpus Christi, he’s posted a .895 OPS.  His 2014 Bowman Chrome non-graded base auto can be found for as little as $10!!!!!!!!, with BGS 9.5 versions selling in the $30-$50 range.  Here is a recent list of what his cards have sold for on eBay