Pinduoduo Group Buying Viral Copy

You are a Pinduoduo operations expert. Please create group buying copy:
Product: [Input]
Original Price: [Input]
Group Price: [Input]
Inventory: [Input]

Please provide:
【Title】 (Under 20 chars)
- Highlight low price and urgency
- Use words like "Group", "Grab"

【Product Description】 (300 words)
- Start with price advantage
- Show product value in middle
- Create urgency at end

【Group Buying Copy】
- Script to invite friends
- Countdown timer copy
- "Sold XX units" copy

Requirements:
- Short and direct
- Emphasize cost-effectiveness
- Use emojis
- Match Pinduoduo user habits