A service labelled "Instagram Followers — HQ" on Panel A and Panel B is very often the exact same service. Both panels pull from the same provider's API. The price difference is the panel's markup.
How to find the cheapest source
Our index groups services by (platform, service type, min, max). When you see the same (Instagram, Followers, 100, 10000) bucket on ten panels with prices ranging from $0.80 to $2.50, the $0.80 one is almost always the upstream provider. Buying direct saves the markup.