A lower number on the pricing page is not always a lower bill. Here is what the sub-$2 rates on this table actually require:
Proxy-Cheap's $0.78/GB is a promotion you may not be able to buy. It's marked “−70%” against a ~$2.60/GB base and requires the 51 GB+ tier — yet their FAQ caps self-serve residential top-ups at 50 GB per month. The tiers you can actually reach are $1.50/GB (−50%) and $1.20/GB (−60%), and promotional rates can revert.
Infatica's advertised "from $0.30/GB" is not a residential rate at all. On their pricing page that $0.30 ladder sits in the Shared Datacenter panel. Residential is $4/GB pay-as-you-go, reaching $2.60/GB only at 1,000 GB per month, so at the entry price it is double Roam's flat rate.
Rayobyte's $0.50/GB needs 5 TB+ per cycle. Entry pricing is $3.50/GB, there is no pay-as-you-go option on their pricing page, and the cheap rate is a quote-only enterprise tier. Credit to them for loud, certified ethical sourcing.
PacketStream's $1/GB flat is genuinely cheap. It's a peer-to-peer network with a $50 minimum purchase and fewer targeting/enterprise controls — a real option if raw price is all that matters to you. The $0.10/GB figure on their site is what they pay people who share bandwidth, not a rate you can buy at.
Decodo's committed rates need $275–$2,000+/mo. The polished $2.00–$2.75/GB tiers exist, but only if you pre-commit monthly spend; PAYG is $4/GB.