On Suppliers, list each one with a contact, phone, email, KRA PIN, payment terms and lead time, and their total bought, last order and order count fill in from your purchases. On Products & Prices, record who sells what at what price, and a Cheapest flag marks the best price for each product. On Purchases, log every purchase and it drives each supplier's totals.
The Summary gives you total spend and a spend-by-supplier table. Yellow cells are your only inputs. The premium version adds a dashboard that, for any product you pick, lines up every supplier's price and names the cheapest, plus a spend analysis by payment terms and a printable A4 supplier profile. Opens in Excel, WPS or Google Sheets.