Well, since Survival blue doesn't have Op/reinfoced gear, I can only assume you are talking about items that are simply difficult to get So I will split my list into sections of hard to get and essentially illegal to have:
Hard to get:
Elytra- 30-75k
Thorns III- 30-45
Max sword: 50k
Max gear: 35-50k
Essentially illegal:
Barrier: 1.5 mil
Bedrock: 2 mil
Void block: Very expensive