It's all good, you can.
/V
so i have 2 bottles of test e which is 100mg/ml and i need 2 more bottles. i can get 2 bottles that is 250mg/ml.
is it bad to take 2 different ones during the same cycle? ie. use the 100mg/ml for the 4 weeks it would last, then the 250mg/ml the remaining 4 weeks of the cycle?


It's all good, you can.
/V
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As long as the gear is legit!
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definitely fine to do, but based on your math it sounds like you are running the 100mg/ml @ 500 per week. with 250mg/ml this should last an additional 10 weeks if you get 2 vials. (assuming they are 10ml)
if you were only planning on running test-e for 8 weeks I would recommend pushing it to at least 12, enanthate gains wont fully kick in for a few weeks so no reason to cut it short and miss out on a month or so of additional gains
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