what seems to be cheap but are extremely useful?

I saw a post which asked for expensive stuff that are very useful and it was very informative, so I wanted to know the cheap ones.

Consider cheap to be < 1000 Rupees or 15 Dollars

According to me:

• PS5 Subscription - Amazing games at cheap rate
• Pendrives - Carry your most important/ much needed documents in ur wallet/purse
• Laptop stand - Small screen? Back pain? Have your laptop at your eye level.

Now it’s your turn to tell me some!