Retailers like eBay and Walmart offer bulk packs of generic PEG 3350 (e.g., Member's Mark or Equate) to reduce costs.
Polyethylene glycol (PEG) can be purchased from various sources depending on whether you need it for personal health, laboratory research, or industrial manufacturing. Personal and Healthcare Use where to buy polyethylene glycol
Many of these products are eligible for purchase using Flexible Spending accounts or Health Savings Accounts. Laboratory and Research Grade Retailers like eBay and Walmart offer bulk packs