Hi Nokira,
We do indeed have Serum available (both M and F) from our Twin Peaks Mall store (Level 1, Shop 10).
Unfortunately, BP's for the Harness are proving to be rather elusive at the moment, but we do have all the other parts in stock currently. We will endeavour to obtain BP's for the Harness as soon as possible so please check back with us regularly.
Please feel free to PM me if you have any further questions.
Regards
EwoK