Ha, I've done that exact same thing too many times to count.
The final code is $('enter-price-input').val(data.price.replace('$','')); because only number should be copied to the CustomerEnteredPrice text box.
Finally, I fixed all small challenges of displaying customer entered prices vs product unit price.
Q: Is there a way to limit sales reps can access only "Impersonate" option in Customers? To let sales reps access the impersonate options, it looks like all sales reps need the administrator privilege and can access any options.