Buy Local...It's a Jewish Thing An ELI Talk by Nell Mahgel-Friedman
(יד) וְכִֽי־תִמְכְּר֤וּ מִמְכָּר֙ לַעֲמִיתֶ֔ךָ א֥וֹ קָנֹ֖ה מִיַּ֣ד עֲמִיתֶ֑ךָ אַל־תּוֹנ֖וּ אִ֥ישׁ אֶת־אָחִֽיו׃
(14) When you sell property to your neighbor, or buy any from your neighbor, you shall not wrong one another.

(יד) וכי תמכרו וגו'. לְפִי פְשׁוּטוֹ כְמַשְׁמָעוֹ; וְעוֹד יֵשׁ דְּרָשָׁה: מִנַּיִן כְּשֶׁאַתָּה מוֹכֵר, מְכוֹר לְיִשְׂרָאֵל חֲבֵרְךָ? תַּ"לֹ וְכִי תִמְכְּרוּ מִמְכָּר — לַעֲמִיתְךָ מְכוֹר, וּמִנַּיִן שֶׁאִם בָּאתָ לִקְנוֹת קְנֵה מִיִּשְׂרָאֵל חֲבֵרְךָ? תַּ"לֹ אוֹ קָנֹה — מִיַּד עֲמִיתֶךָ (ספרא):

(טו) אל תונו. זוֹ אוֹנָאַת מָמוֹן (בבא מציעא נ"ח):

(14) ‎'וכי תמכרו וגו‎‎‎‎ AND IF THOU SELL [OUGHT TO THY FELLOW… YE SHALL NOT OVERREACH ONE ANOTHER] — According to its plain sense the verse intimates what it literally means: (i. e. as translated above). But there is also a Midrashic interpretation: Whence can it be derived that if you sell anything you should sell it to your Israelite fellowman? From what Scripture states: “And if you sell — ,לעמיתך sell it to one associated with you by nationality”. And whence can it be derived that if you intend to buy anything that you should buy it of your Israelite fellow? From what Scripture states “or if thou buy ought — מיד עמיתך, at the hand of one associated with thee, buy it” (Sifra).

(15) אל תונו YE SHALL NOT WRONG [ONE ANOTHER] — This refers to wronging in money matters.

(ז) שְׁמוֹנֶה מַעֲלוֹת יֵשׁ בַּצְּדָקָה זוֹ לְמַעְלָה מִזּוֹ. מַעֲלָה גְּדוֹלָה שֶׁאֵין לְמַעְלָה מִמֶּנָּה זֶה הַמַּחֲזִיק בְּיַד יִשְׂרָאֵל שֶׁמָּךְ וְנוֹתֵן לוֹ מַתָּנָה אוֹ הַלְוָאָה אוֹ עוֹשֶׂה עִמּוֹ שֻׁתָּפוּת אוֹ מַמְצִיא לוֹ מְלָאכָה כְּדֵי לְחַזֵּק אֶת יָדוֹ עַד שֶׁלֹּא יִצְטָרֵךְ לַבְּרִיּוֹת לִשְׁאל. וְעַל זֶה נֶאֱמַר (ויקרא כה-לה) "וְהֶחֱזַקְתָּ בּוֹ גֵּר וְתוֹשָׁב וָחַי עִמָּךְ" כְּלוֹמַר הַחֲזֵק בּוֹ עַד שֶׁלֹּא יִפּל וְיִצְטָרֵךְ:

(7) There are eight levels of charity, one above the other. The greatest level that has nothing above it is to strengthen the hand of a Jew who has become poor and give him a gift or loan or create a partnership with him or make up some work for him, so as strengthen his hand until he does not [any longer] need to ask others [for help]. And about this it is said (Leviticus 25:35), "and you shall strengthen the hand of a stranger and a resident and he shall live with you;" meaning, strenghten him until he no [longer] falls and becomes needy.