Online Arbitrage for Amazon FBA

Looking for a VA that is specialized in Online Arbitrage for Amazon FBA.

These Criteria need to be followed strictly, no exceptions!

Price Stability: Constant over the last 180 days.
Buy Box Rotation: Good
Number of FBA Sellers: 3-15
Monthly Sales Minimum: 200 units
ROI: 25% or higher
Selling by Amazon/Brand: No Amazon or brand on the listing
Product Size/Weight: Light and small for lower shipping/storage costs
Profit Margin: At least $4-$5 per unit after all costs (including shipping and taxes)
Seasonality: no seasonality items
NO Variety on item
NOT meltable
NO Hazmat or dangerous goods
Compliance: All Amazon policies must be met
Customer Reviews: good amount of positive reviews
Legal: No IP issues, or trademark / patent issues?