The VTEC solenoid gasket is a common leaking problem and not hard to replace. It's Honda part # 15825-P08-005. If there's not an Acura dealer near you, Honda may also have one in stock because it's also in the '99-'00 Civic Si, and the VTEC Del Sol's. It's $20.88 at my own local Honda dealership, but I found one for $14.23 shipped on Ebay.
There's also a smaller gasket underneath the top section of the solenoid. Probably not where your leak is coming from, but might as well replace it while your in there. It's part # 36172-P08-015, costs $8.50 at Honda, I couldn't find one cheaper than that on Ebay.
The cam seal is also a common leak on GSR's, the OEM seal really sucks. There's many aftermaket companies that make cam seals like OBX, SR, Password JDM, Golden Eagle, Skunk2, and more. Choose a color/style you like from those. Warning, the cam seal is harder to replace than it looks.