If you can afford $50 per payday to make payments, then just set that $50 aside every payday now. In 2 months you would have $200 which should be enough for a mix I would think. If not then save for another month. I doubt you'll find anyone who will take payments. Good luck.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226