digikey.com
In the search window type 'opamp'.
Choose the first choise "Amplifiers-Instrumentation, OP Amps...."
If the only thing you care about is Gain Bandwidth Product then choose 15mhz, or choose a range. Hit Apply.
There is 177 choices.
Number of circuits =1 Apply.
There are 68 choices.
There are 3 types of 8 pin dips.
11 choices. LM318, LT318, NJM318, CA3130......